Manufacture of drills or bits.



PATENTED JULY 28, 1908.

L. D. BROWN. MANUFACTURE OF DRILLS OR BITS.

APPLICATION FILED JULY 26.1907.

Wifncooeo UNITED STATES PATENT OFFICE.

I LEWIS DALEBROWN, OF BUTLER, PENNSYLVANIA.

imam-1m. as DIBgILLS on BITS.

v I Specification of Letters Patent,

ap lication filed July 2s,-19o1.' seriiino. $85,664.

Patented July 28, 1908.

To all whom a may mea.

Be it known that 1, Mains DALE BROWN,

' a citizen of'theUnitedStates of America, re-

siding at Butleri in the county of Butler and,

State of Penns vania, have invented certain new and usefu Improvements in the Manu- 4 facture of Drills or Bits, of which the following the same are removed from the opening.-

The metal surrounding the pattern 1s then mg. is a specification, ref,erence being had therein to the accompanying drawing.

This invention 'relate's to gn rovements in the-manufacture-of drills and its, and more gartic'ularl to a novel mold for forming rills and its u'se'dfor drilling wells. The invention has for its object to rovide' a durable mold that ca be used for orming a plurality of drills or its, the mold being constructed into. two parts, whereby the finished product can be easily and quickly 'removed from the mold.

The detail construction entering into my resently described, and pointed out in the appended of two parts 1 and 2, these parts being formed of metal. Tc produce parts 1 and 2 I usean ordinary drill or bit 3 as a pattern and suitably support the same, in anopenin 4*in-to which molten metal can be poure The opening 4 is formed in sand or similar ma-' terial, and after the opening has been filled with molten metal, an the metal permitted to cool, the pattern and the metal surrounddrilled to provide transverse openin s5 and is sawed or otherwise cut to form t e parts 1 and 2. It is therefore obvious that after the parts have been formed, that the pattern 3 can be easilyremoved. The metallic parts 1 and 2. are then connected together by fastening means (not shown) passing through I the transverse openings5, thus providing a concavity 6 into which molten metal can be pour'edto produce a drill or bit conforming in.

.all respects to the attern 3.

The mold forme by the parts 1 and 2 can beused numerous times for forming drills or bits, and while I have not herein specified any material for preventing the attern or the roduct from adhering to the sldes of the mold, it will be understood that a suitable material canbe em loyed for this purpose. It will thus be offserved that I have devised a sim la and inexpensive'm'old that y can be roug ly handled without being in- .jured, the. mold being designed to produce a drill 0r bit that can e used for the purpose for which it is intended. I

Having full y described my invention, what I claim and desire to secure by Letters Patentis: The hereindescribed mold composed of opposite similar half-sections each provided on the inner face with a attern cavity, each A half .of the mold provi r ed with transverse apertures located approximately midway the ends of the mold sections and on opposite sides of the pattern cavity to receive means for securing the sections together.

In testimony whereof I affix my signature in the presence of two witnesses.

LEWISDALE BROWN. Witnesses; JAMES E. MARSHALL,

,. THOMAS W. WATSON. 

